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Earnings Per Share and Dividends - Dividends (Details) - USD ($)
$ / shares in Units, $ in Thousands
May 31, 2019
May 31, 2018
Quarter One    
Dividends Payable [Line Items]    
Dividend per Share (in dollars per share) $ 0.08 $ 0.08
Total of Cash Dividends Declared $ 13,226 $ 14,588
Quarter Two [Member]    
Dividends Payable [Line Items]    
Dividend per Share (in dollars per share) $ 0.08 $ 0.08
Total of Cash Dividends Declared $ 12,706 $ 14,272
Quarter Three [Member]    
Dividends Payable [Line Items]    
Dividend per Share (in dollars per share) $ 0.08 $ 0.08
Total of Cash Dividends Declared $ 12,681 $ 13,991